Rumor has it that Exchange Server 2007 Service Pack 1 will arrive by late October or early November. Fortunately, if you've got an Exchange test server running, SP1 is available in a public beta that you can try, and try it you should. Microsoft went to some trouble to make this one worth the download.
First, SP1 has a definite smoothing effect on the relationship between Exchange Server 2007 and Office Communications Server 2007. So much so that the unofficial word is that running a combination of OCS and Exchange without SP1 is a mistake. SP1 also addresses a number of administrative concerns that users expressed since Exchange 2007 rolled out, which includes not only updated GUI tools but full Windows Server 2008 and Vista support ('bout time).
Last, it adds to Exchange's security capabilities by beefing up secure e-mail access, improving support for encrypted e-mails and introducing an additional high-availability and fail-over option.
Microsoft, Exchange Server 2007, Service Pack, Exchange Server 2007 SP1, Review